单项选择题

You should know better than ______ your little sister at home by herself.

[A] to leave
[B] leaving
[C] to have left
[D] left
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单项选择题
Water is an essential global resource and it is up to each of us to ______ it.
[A] preserve
[B] maintain
[C] reserve
[D] conserve
单项选择题
John is the most brilliant guitarist in our city, Roger ______ him closely.
[A] followed
[B] following
[C] to follow
[D] being followed
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